1604936666825 has 24 divisors (see below), whose sum is σ = 2118105613368. Its totient is φ = 1202161582080.

The previous prime is 1604936666779. The next prime is 1604936666831. The reversal of 1604936666825 is 5286666394061.

It can be written as a sum of positive squares in 12 ways, for example, as 399104272009 + 1205832394816 = 631747^2 + 1098104^2 .

It is not a de Polignac number, because 1604936666825 - 2¹² = 1604936662729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9701192 + ... + 9865241.

It is an arithmetic number, because the mean of its divisors is an integer number (88254400557).

Almost surely, 2^{1604936666825} is an apocalyptic number.

It is an amenable number.

1604936666825 is a deficient number, since it is larger than the sum of its proper divisors (513168946543).

1604936666825 is a wasteful number, since it uses less digits than its factorization.

1604936666825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19566653 (or 19566648 counting only the distinct ones).

The product of its (nonzero) digits is 67184640, while the sum is 62.

The spelling of 1604936666825 in words is "one trillion, six hundred four billion, nine hundred thirty-six million, six hundred sixty-six thousand, eight hundred twenty-five".